1@startuml2!include C4_Context.puml34title System Context diagram for Internet Banking System56Person(customer, "Banking Customer", "A customer of the bank, with personal bank accounts.")7System(banking_system, "Internet Banking System", "Allows customers to check their accounts.")89System_Ext(mail_system, "E-mail system", "The internal Microsoft Exchange e-mail system.")10System_Ext(mainframe, "Mainframe Banking System", "Stores all of the core banking information.")1112Rel(customer, banking_system, "Uses")13Rel_Back(customer, mail_system, "Sends e-mails to")14Rel_Neighbor(banking_system, mail_system, "Sends e-mails", "SMTP")15Rel(banking_system, mainframe, "Uses")16@enduml